The supply of donated blood is becoming critically low, and hospitals desperately need donors. Butler Memorial Hospital, in partnership with Community Blood Bank, is hosting a blood drive from 10 a.m. to 4 p.m. Tuesday, Jan. 21, in its Nixon Sarver Classroom.

Donors can register online at fourhearts.org or call 1-877-842-0631. Prescheduling is encouraged, but walk-ins are allowed. All donors must be at least 17 years old, weigh at least 110 pounds, and have had no tattoos or piercings in the past three months.